Quantification of Cognitive Process Degradation While Mobile, Attributable to the Environmental Stressors Endurance, Vibration, and Noise
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Operator cognitive performance was quantified in an off-road environment by repeatedly administering a battery of cognitive measures to assess the genus and degree of performance while mobile. Environmental stressors referred to as endurance, tracked vehicle vibration per intensity, and noise were recorded over the course of one day per participant n18. Vibration conditions presented were varying amplitudes approximating accelerations of 0.88 g by a frequency of 3 cycles per second cps, 0.65 g by 4 cps, and 0.03 g by 12.5 cps. Observed collectively, the predictor variables returned a multiple R value for the dependent variable percent correct of 0.733 p .0001 and for the dependent time to complete of 0.649 p .0001. Although all stressors significantly influenced performance, uncovered was a repeated order of effect per method of evaluation, beginning with the measure endurance, then session, followed by absorbed power recordings, then exposure limit criteria comparison, and finally, noise. Cognitive performance decrement measured as percent correct was found for the cognitive concepts time sharing, selective attention, inductive reasoning, spatial orientation, speed of closure, and memorization. Measured as percent of time taken to complete tests, degradation was found for the concepts speed of closure, time sharing, inductive reasoning, spatial orientation, selective attention, and memorization. This investigation displayed the existence of dose response relationships, higher doses of vibration associated with more unfavorable effects. Additionally, the trials effect recorded indicates that performance deteriorated as a function of time in the environment.